Pad



S. G. LUTHER Nov. 4,' 1958 PAD Filed April 15, 1955 FIGZ.

FIGS

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FIG.7.

United States Patent PAD Stephen G. Luther, Belleville, Ill., assignor to Midwest Rubber Reclaiming Company, East St. Louis, Ill., a corporation of Delaware Application April 13, 1955, Serial No. 501,132

2 Claims. (Cl. 23S-283) This invention relates to pads, and more rparticularly to railroad tie pads. g

Among the several objects of the invention may be noted the provision of a pad particularly for use as a railroad tie pad, although useful for other purposes, which by virtue of its shape is adapted to make a tight seal all around its edges with the tie to keep out dirt and water; the provision of a pad of this class which has great compressive strength and a minimum of lateral distortion under high compression loads; and the provision of a pad of this class which is resistant to fatigue and resistant to tearing at the holes for the spikes which fasten the railroad 4rail to the tie. Other objects and features will be in part apparent and in part pointed out hereinafter.

The invention accordingly comprises the constructions hereinafter described, the scope of the invention being indicated in the following claims.

`In the accompanying drawings, in which one of various possible embodiments of the invention is illustrated,

Fig. l is a perspective View of the pad of this invention;

Fig. 2 is an enlarged section taken on line 2 2 of Fig. 1;

Fig. 3 is lan enlarged section taken on line 3 3 of Fig. 1;

Fig. 4 is a side elevation of the pad on a larger scale than Fig. 1;

Fig. 5 is an enlarged fragmentary section taken on a plane generally at right angles to certain cords of the pad and generally 4parallel to certain other cords ofthe pad:

Fig. 6 is a View of `one of the corners of the pad with portions of the pad at the corner removed as on line 6 6 of Fig. 5;

Fig. 7 is a side elevation showing an installation ncluding a -pad of this invention; and,

Fig. 8 is an end view of Fig. 7 with parts shown in section.

Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.

Referring first to Figs. 1 4 of the drawings, a pad of this invention is generally designated 1. The pad is shown to be of rectangular shape in plan, its side edges being designated 3, and its end edges being designated 5. The pad consists of `a plurality of cord plies each designated 7 with layers of rubber 9 between the cord plies and at the faces of the pad. The union between the cord plies 7 and layers of rubber 9 is preferably 'strengthened by vu'lcanization of the rubber. tween the cord plies are thin with respect to the thickness of the cord plies (see Fig. 5). The cord is preferably a high quality dipped .cord such as that used in tires. The rubber may be naturaL'synthetic or reclaimed or a mixture of any two or all three of these. The adjacent cord plies are at angles to 4one another, and al1 the cord plies are on the bias with respect to the edges 3 and 5 of the Ipad gsee Fig. 6). For example, adjacent cord The layers of rubber be,

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plies may be at right angles to one another and ata fortyiive degree angle with respect to the edges of the pad. Theadjacent cord plies may be at other angles to each other or to the edges of the pad without atecting the utility of the product for the intended purposes. The pad when unstressed is of arched conformation both lengthwise and widthwise of the pad, edges 3 and edges 5 -being curved as apparent from Figs. 1 and 4, the pad having greater .curvature along its Widthwise and1ength wise center lines than along its edges.

Figs. 7 and 8 show how the pad 1 is used between a tie plate 11 and a tie 13. A rail is indicated at 15 and spikes for fastening the rail and tie plate to the tie are indicated at 17. Prior to application to the tie, the pad is usually dipped in a fungicide and an insecticide. The pad is applied to the tie with its concave face 19 down. A suitable adhesive may be applied to the concave face of the pad for bonding the pad to the tie. When the tie plate and rail are applied, the pad is attened as shown in Figs. 7 and 8. This stresses the pad in such manner that its edges 3 and 5 make a tight seal with the tie, thereby to exclude dirt and water from between the .pad and the tie.

-In View of the presence of the cord plies and the thinness of the rubber between the cord plies, the pad undergoes only a minimum of lateral distortion under the high compression to which it is subjected, while having great strength in compression and resistance to fatigue. In view of the cross-arrangement of successive cord plies and the bias arrangement of these plies relative to the edges 3 and 5, the pad is resistant to tearing at the spike holes. The pad is sufficiently resilient to dampen shocks and vibration and acts effectively as a thermal insulator between the tie and the tie plate.

While -a pad containing tive cord plies is shown, it will be understood that the pad may have more or less cord plies according to requirements, fPads of this nvention may be used as shims on ties to 'build up rails to the proper elevation, they -may also be used in crossings `and switch frogs, and for various purposes other than railroad purposes.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that Vall matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

`I claim:

1. In a railroad track having ties, rails, tie plates and spikes for fastening the rails and tie plates to the ties, a pad disposed between a tie plate and a tie, said pad comprising a plurality of cord plies with layers of rubber between the cord plies and at the faces of the pad, said pad being of substantially uniform thickness throughout its entire area, said pad in its unstressed condition being of arched conformation both lengthwise and widthwise, `said Ipad being placed on the tie with its concave face down and being flattened between the tie plate and the tie so that its edges make a tight seal with the tie, thereby to exclude dirt and water from between the pad and the tie.

2. In a railroad track having ties, rails, tie plates and spikes for fastening the rails and tie plates to the ties, a pad disposed between a tie plate and a tie, said pad being of generally rectangular shape and comprising a plurality of cord plies with layers of rubber between the cord plies and at the faces of the pad, said pad being of substantially uniform thickness throughout its entire area, the rubber layers being thin relative to the cord plies, adjacent cord plies being at vangles to one another, and

' I Y n Y 2,858,988 Y l L all the cord plies being on the bias with respect to the and the bias arrangement of the cord plies making the edges 'of the "pad 'and'with respect 'tothe 'tie 'andthe'raiL `pad resistant 'to tearing at the Aspike holes.

said pad in its unstressed condition being of arched conformation both lengthwise and widthwise, the edges of References Cited in the le of this patent the pad being'curvedand thepadl'having greater curvature 5 longiits leng'thwise'and'widthwise centerlinest'hanalong UNITED STATES PATENTS its `ed'ges,-said pa'd being placed onthe tie with iits con- 662,963 Preston et al.l Dec. 4, 1900 cave face d'own'an'd being attenedtbetween the tie plate 1,436,394 Hawkinson Nov. 21, 1922 and the tie so that 'its edges make a-tightsea1 with the 1,650,420 Boyce Nov. 22, 1927 tie, thereby to excludedirt and Ywater from `between Athe 10 2,214,628 Upchurch .Sept. 10, 1940 pad and the tie, thespikesbeing driven 'through'the pad, y2,495,808 Colmant .Jan..31, 1950 

